First order magneto-structural transition and large magnetocaloric effect in MnFeNiSi1.5-xAlx intermetallics

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Physica B-condensed Matter Pub Date : 2025-05-08 DOI:10.1016/j.physb.2025.417373

MinJie Ji , Haicheng Xuan , CuiCui Hu , Lina Jiang , Zhida Han , Fenghua Chen , Junwei Qiao

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引用次数: 0

Abstract

MM'X (M, M' = transition metals, X = carbon or boron group elements) intermetallics experiencing magneto-structural transition have great potential in multifunctional applications due to the various magneto-responsive effects. This study introduces a method to finely tune structural transitions in MM'X systems over a broad temperature range. Through systematic analysis of MnFeNiSi_1.5-xAl_x (x = 0.065–0.095) intermetallics, a coupled magneto-structural transition was realized, characterized by the transformation from ferromagnetic TiNiSi-type orthorhombic phase at lower temperatures to paramagnetic Ni₂In-type hexagonal phase at elevated temperatures. A Curie-temperature window ranged from 199 to 328 K is established. The MnFeNiSi_1.435Al_0.065 exhibits superior magnetocaloric performance, characterized by a magnetic entropy change of −28.6 J kg⁻¹ K⁻¹ under an external magnetic field excitation of μ₀ΔH = 5 T. Concurrently, this composition achieves a relative cooling power of 235.5 J/kg under equivalent field conditions, underscoring its potential for advanced refrigeration applications.

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MnFeNiSi1.5-xAlx金属间化合物的一阶磁结构转变和大磁热效应

MM'X （M， M' =过渡金属，X =碳或硼族元素）金属间化合物由于具有多种磁响应效应，在多功能应用中具有很大的潜力。本研究介绍了一种在宽温度范围内微调MM'X系统结构转变的方法。通过对MnFeNiSi1.5-xAlx （x = 0.065 ~ 0.095）金属间化合物的系统分析，实现了一种磁-结构耦合转变，其特征是低温下由铁磁性的tini型正交相转变为高温下顺磁性的ni2in型六方相。建立了199 ~ 328 K的居里温度窗。MnFeNiSi1.435Al0.065表现出优异的磁热性能，在μ0ΔH = 5 t的外磁场激励下，其磁熵变化为−28.6 J kg−1 K−1，同时，该组合物在等效磁场条件下的相对冷却功率为235.5 J/kg，突出了其在先进制冷应用中的潜力。

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces